I like the sheer practicality of it.
It'll burn pretty much anything you can get in the chimney (Do Not try Reedmace heads !!)
and efficiently bring water to the boil.
That I can use it safely pretty much anywhere is a great plus too.
The extra that is the firebowl/ash and cinder catch makes a great wee stove for cooking on too. I've made cake it that, and baked potatoes, left a pot of stew to cook slow on the embers.....
It's just a really good bit of kit, if you like that kind of stuff. If you'd rather have disposable gas canisters, or carry fuel in a bottle, that's up to yourself, but the KK and it's clones; they work.